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KS8993M Datasheet(PDF) 36 Page - Micrel Semiconductor

Part No. KS8993M
Description  Integrated 3-Port 10/100 Managed Integrated 3-Port 10/100 Managed
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
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KS8993M Datasheet(HTML) 36 Page - Micrel Semiconductor

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Micrel, Inc.
KS8993M/ML/MI
April 2005
36
M9999-041205
DA found in
Static MAC
Table?
Use FID flag?
FID match?
DA+FID
found in
Dynamic
MAC Table?
Action
No
Don’t care
Don’t care
No
Broadcast to the membership ports
defined in the
VLAN Table bits [18:16]
No
Don’t care
Don’t care
Yes
Send to the destination port defined in the
Dynamic MAC Address Table bits [53:52]
Yes
0
Don’t care
Don’t care
Send to the destination port(s) defined in
the
Static MAC Address Table bits [50:48]
Yes
1
No
No
Broadcast to the membership ports
defined in the
VLAN Table bits [18:16]
Yes
1
No
Yes
Send to the destination port defined in the
Dynamic MAC Address Table bits [53:52]
Yes
1
Yes
Don’t care
Send to the destination port(s) defined in
the
Static MAC Address Table bits [50:48]
Table 9. FID+DA Lookup in VLAN Mode
FID+SA found in Dynamic
MAC Table?
Action
No
Learn and add FID+SA to the Dynamic MAC Address Table
Yes
Update time stamp
Table 10. FID+SA Lookup in VLAN Mode
Advanced VLAN features, such as “Ingress VLAN filtering” and “Discard Non PVID packets” are also supported
by the KS8993M. These features can be set on a per port basis, and are defined in register 18, bit 6 and bit 5,
respectively for port 1.
QoS Priority Support
This feature provides Quality of Service (QoS) for applications, such as VoIP and video conferencing. The
KS8993M per port transmit queue could be split into two priority queues: a high priority queue and a low priority
queue. Bit 0 of registers 16, 32 and 48 is used to enable split transmit queues for ports 1, 2 and 3, respectively.
Optionally, the Px_TXQ2 strap-in pins can be used to enable this feature. With split transmit queues, high priority
packets will be placed in the high priority queue and low priority packets will be placed in the low priority queue.
For split transmit queues, the KS8993M provides four priority schemes:
1.
“Transmit all high priority packets before low priority packets;” i.e. a low priority packet could be transmitted
only when the high priority queue is empty
2.
“Transmit high priority packets and low priority packets at 10:1 ratio;” i.e. transmit a low priority packet after
every 10 high priority packets are transmitted, if both queues are busy
3.
“Transmit high priority packets and low priority packets at 5:1 ratio”
4.
“Transmit high priority packets and low priority packets at 2:1 ratio”
If a port's transmit queue is not split, both high priority packets and low priority packets have equal priority in the
transmit queue. Register 5 bits [3:2] are used to select the desired priority scheme. Optionally, the PRSEL1 and
PRSEL0 strap-in pins can be used.


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